function validate(field) {
				
				var valid = "0123456789";

				var ok = "1";
				var temp;

				for (var i=0; i<field.length; i++) {
					temp = "" + field.substring(i, i+1);

					if ( (valid.indexOf(temp) == "-1") || (field.length != 8) ) ok = "0";
				}
				return ok;
			}